Stock Benefit Plans (Narrative) (Details) $ / shares in Units, $ in Millions			1 Months Ended					12 Months Ended
	May 21, 2020 shares	May 01, 1999 purchase	May 31, 2018 shares	Mar. 31, 2018 shares	May 31, 2007 shares	Mar. 31, 2007 shares	Jul. 31, 2002 shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, weighted-average grant-date fair value (in dollars per share) | $ / shares								$ 41.92	$ 31.38	$ 22.25
Total intrinsic value of options exercised | $								$ 164	$ 56	$ 138
Cash received from the exercise of stock options | $								$ 116	50	103
Restricted Stock Units and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period over which that cost is expected to be recognized, years								1 year
Vesting period, years	3 years
Total fair value of shares distributed in connection with non-option equity awards | $								$ 398	$ 560	$ 278
Unrecognized compensation cost | $								368
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to option awards | $								$ 30
Weighted-average period over which that cost is expected to be recognized, years								1 year 4 months 17 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value (in dollars per share) | $ / shares								$ 165.05	$ 152.34	$ 120.19
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Performance-based restricted stock unit payable range minimum								0.00%
Performance-based restricted stock unit payable range maximum								200.00%
Performance period	3 years
Weighted-average grant-date fair value (in dollars per share) | $ / shares								$ 170.80	$ 151.00	$ 122.77
Number of shares which became distributable during the period								413,160
Performance Stock Units | PSUs Awarded in 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years								3 years
Target payout percentage								200.00%
2020 Incentive and Stock Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized (in shares)	20,000,000
2020 Incentive and Stock Award Plan | Restricted Stock Units and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized (in shares)	12,500,000
2020 Incentive and Stock Award Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage	25.00%
Contractual term of stock option awards	10 years
1999 Plan | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized (in shares)								40,350,000
Number of share purchase times per plan year | purchase		4
Stock option price (as a percent)		95.00%
Reduction in the shares available (in shares)						10,000,000
Shares due to shareholder action (in shares)			4,750,000
Shares purchased by employees (in shares)								331,017
Shares available for issuance under the plan (in shares)								3,862,742
International Plan | Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized (in shares)								11,000,000
Reduction in the shares available (in shares)				1,000,000
Shares due to shareholder action (in shares)					4,000,000		5,000,000
Shares purchased by employees (in shares)								116,578
Shares available for issuance under the plan (in shares)								804,211